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"Ready" is All Relative

"Just because a woman is lubricated doesn't mean she's ready for sex," says Richters. Your woman's real prime time comes once she reaches a phase of arousal called "uterine tenting." It's just like it sounds: The uterus backs out of the way and the vagina grows in length by as much as an inch.

"You'll experience deeper penetration, and the vagina will provide an intense grip to the head of your penis," says Barbara Keesling, Ph. D., a lecturer on human sexuality at California State University at Fullerton and the author of Men in Bed. "The orgasms are incredible."

Keesling says the best position is the butterfly: "Have her lie on her back and pull her knees up to her shoulders, tilting her pelvis so her vagina points up almost to the ceiling," she says.

Since tenting can take anywhere from 30 seconds to, well, forever, focus on synchronizing the stimulation between your penis and her outer lips before entering her. Lie pressed against each other with your penis snug between her legs, allowing her to slide and rub against you while you use your hands and mouth elsewhere. The warm, slick, and firm contact will bring her to a boil in no time.